Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Generic OBD-II PIDs
If a generic OBD-II scan tester is used it may require PID number to be entered. See GENERIC PID DEFINITION table. Turn ignition off. Ensure test equipment is properly attached. Program scan tool using the following steps:
- Select vehicle and engine selection menu (optional).
- Select year, engine, model and any additional information requested by scan tool (optional).
- Select GENERIC OBD-II OPTIONS. Press CONT button if monitors are not complete.
- Select PID/DATA MONITOR.
- Turn ignition on or start engine and allow to idle.
- Follow operating instructions from scan tool menu.
- Select PIDs and press START.
| Acronym | Description | ||
|---|---|---|---|
| CCNT | HO2S Sensor Voltage Cross Count | ||
| ECT | (1) Engine Coolant Temperature (Open Or Closed Loop) | ||
| FUEL SYS1 | (1) Fuel System Status Bank No. 1 (Open Or Closed Loop) | ||
| FUEL SYS2 | (1) Fuel System Status Bank No. 2 (Open Or Closed Loop) | ||
| OBD SUP | Oxygen Sensor 11 (Volts) | ||
| O2S11 | Oxygen Sensor 11 (Volts) | ||
| O2S12 | Oxygen Sensor 12 (Volts) | ||
| IAT | Intake Air Temperature | ||
| LONGFT1 | (1) Long Term Fuel Trim Bank 1 (Percent) | ||
| LOAD | (1) Engine Load (Percent) | ||
| MAF | (1) Mass Airflow Rate (Lb/M) | ||
| MAP | (1) Manifold Air Pressure (In-Hg) | ||
| MIL | Malfunction Indicator Light | ||
| RPM | (1) Engine RPM | ||
| SHRTFT1 | (1) Short Term Fuel Trim Bank 1 (Percent) | ||
| SHRTFT11 | (1) Short Term Fuel Trim O2S 11 (Percent) | ||
| SHRTFT12 | (1) Short Term Fuel Trim O2S 12 (Percent) | ||
| SPARKADV | Spark Advance Cylinder No. 1 (Degrees) | ||
| TP | Throttle Position (Percent) | ||
| VSS | (1) Vehicle Speed Sensor (MPH) | ||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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